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keyreper,
you can try re-downloading the game.
1) goto the "saves" folder and copy your save to another personal folder.
2) delete the entire game.
3) re-download the game and unzip it.
4) paste your save back into the saves folder.
5) When you load your save game, sleep asap to reset the games configuration automatically.
If your computer does not have a very good graphics card, lower all the graphic settings in the options menu...if you still have problems with lag then you may have an abundance of torches and campfires that lag your game, on a lower end graphics card. (or low ram memory, or low processor). Minimize building alot of torches/campfires...even when they are not lit, the game engine is still checking them every 10 seconds for fuel...if you have many, you may experience some type lag. So destroy unwanted fire objects.
A huge block of glowing crops may cause lag on a low end graphics card too...these issues have all been addressed in the next update. (e.g. crops will not glow anymore, but actually change color themselves, getting rid of any lag)
The next update has been optimized for lag in many aspects of the game, due for release on June 1st.